can anyone tell me what this a body 4 speed came from?

It was in 68, in all likely hood, the std ratio. Namely; 2.66-1.92-1.39-1.00 Stick it in 1st and count the number of turns of the input to make 1 turn of the output.
and FWIW, the dozen or so stampings on A-833s Ive seen look pretty much like that. And yes the A/T stampings are much, much,cleaner.